The invention provides a road network change detection method, and belongs to the technical field of intelligent transportation. The method comprises the steps of: step S01, collecting vehicle trajectory data points, and sorting the same according to a time sequence; step S02, calculating a difference value between the two adjacent vehicle trajectory data points in time, determining and retainingthe vehicle trajectory data points of intersection turning; step S03, performing clustering on the vehicle trajectory data points of intersection turning to identify an urban intersection and an intersection type; and step S04, comparing the intersection information obtained in the step S03 with the intersection information on a map, and when it is determined that a new road or a disappearing roadexists, sending a road change signal to a surveying and mapping department terminal, so that the surveying and mapping department terminal updates the road network map. According to the road networkchange detection method provided by the invention, the detection information is comprehensive, new roads can be discovered, and disappearing roads can also be discovered, so that real-time detection of road network changes is really achieved.